text: #include <GLES2/gl2.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <wayland-client.h>
  #include <wayland-egl.h>
  #include <wlr/render/egl.h>
  #include "xdg-shell-client-protocol.h"
  #include "idle-inhibit-unstable-v1-client-protocol.h"
  
  #include <linux/input-event-codes.h>
  
  /**
   * Usage: idle-inhibit
   * Creates a xdg-toplevel using the idle-inhibit protocol.
   * It will be solid green, when it has an idle inhibitor, and solid yellow if
   * it does not.
   * Left click with a pointer will toggle this state. (Touch is not supported
   * for now).
   */
  
  static int width = 500, height = 300;
  
  static struct wl_compositor *compositor = NULL;
  static struct wl_seat *seat = NULL;
  static struct xdg_wm_base *wm_base = NULL;
  static struct zwp_idle_inhibit_manager_v1 *idle_inhibit_manager = NULL;
  static struct zwp_idle_inhibitor_v1 *idle_inhibitor = NULL;
  
  struct wlr_egl egl;
  struct wl_egl_window *egl_window;
  struct wlr_egl_surface *egl_surface;
  
  static void draw(void) {
  	eglMakeCurrent(egl.display, egl_surface, egl_surface, egl.context);
  
  	float color[] = {1.0, 1.0, 0.0, 1.0};
  	if (idle_inhibitor) {
  		color[0] = 0.0;
  	}
  
  	glViewport(0, 0, width, height);
  	glClearColor(color[0], color[1], color[2], 1.0);
  	glClear(GL_COLOR_BUFFER_BIT);
  
  	eglSwapBuffers(egl.display, egl_surface);
  }
  
  static void pointer_handle_button(void *data, struct wl_pointer *pointer, uint32_t serial,
  		uint32_t time, uint32_t button, uint32_t state_w) {
  	struct wl_surface *surface = data;
  
  	if (button == BTN_LEFT && state_w == WL_POINTER_BUTTON_STATE_PRESSED) {
  		if (idle_inhibitor) {
  			zwp_idle_inhibitor_v1_destroy(idle_inhibitor);
  			idle_inhibitor = NULL;
  		} else {
  			idle_inhibitor =
  				zwp_idle_inhibit_manager_v1_create_inhibitor(
  					idle_inhibit_manager,
  					surface);
  		}
  	}
  
  	draw();
  }
  
  static void pointer_handle_enter(void *data, struct wl_pointer *wl_pointer,
  		uint32_t serial, struct wl_surface *surface,
  		wl_fixed_t surface_x, wl_fixed_t surface_y) {
  	// This space intentionally left blank
  }
  
  static void pointer_handle_leave(void *data, struct wl_pointer *wl_pointer,
  		uint32_t serial, struct wl_surface *surface) {
  	// This space intentionally left blank
  }
  
  static void pointer_handle_motion(void *data, struct wl_pointer *wl_pointer,
  		uint32_t time, wl_fixed_t surface_x, wl_fixed_t surface_y) {
  	// This space intentionally left blank
  }
  
  static void pointer_handle_axis(void *data, struct wl_pointer *wl_pointer,
  		uint32_t time, uint32_t axis, wl_fixed_t value) {
  	// This space intentionally left blank
  }
  
  static void pointer_handle_frame(void *data, struct wl_pointer *wl_pointer) {
  	// This space intentionally left blank
  }
  
  static void pointer_handle_axis_source(void *data,
  		struct wl_pointer *wl_pointer, uint32_t axis_source) {
  	// This space intentionally left blank
  }
  
  static void pointer_handle_axis_stop(void *data,
  		struct wl_pointer *wl_pointer, uint32_t time, uint32_t axis) {
  	// This space intentionally left blank
  }
  
  static void pointer_handle_axis_discrete(void *data,
  		struct wl_pointer *wl_pointer, uint32_t axis, int32_t discrete) {
  	// This space intentionally left blank
  }
  
  static const struct wl_pointer_listener pointer_listener = {
  	.enter = pointer_handle_enter,
  	.leave = pointer_handle_leave,
  	.motion = pointer_handle_motion,
  	.button = pointer_handle_button,
  	.axis = pointer_handle_axis,
  	.frame = pointer_handle_frame,
  	.axis_source = pointer_handle_axis_source,
  	.axis_stop = pointer_handle_axis_stop,
  	.axis_discrete = pointer_handle_axis_discrete,
  };
  
  static void xdg_surface_handle_configure(void *data,
  		struct xdg_surface *xdg_surface, uint32_t serial) {
  	xdg_surface_ack_configure(xdg_surface, serial);
  	wl_egl_window_resize(egl_window, width, height, 0, 0);
  	draw();
  }
  
  static const struct xdg_surface_listener xdg_surface_listener = {
  	.configure = xdg_surface_handle_configure,
  };
  
  static void xdg_toplevel_handle_configure(void *data,
  		struct xdg_toplevel *xdg_toplevel, int32_t w, int32_t h,
  		struct wl_array *states) {
  	width = w;
  	height = h;
  }
  
  static void xdg_toplevel_handle_close(void *data,
  		struct xdg_toplevel *xdg_toplevel) {
  	exit(EXIT_SUCCESS);
  }
  
  
  static const struct xdg_toplevel_listener xdg_toplevel_listener = {
  	.configure = xdg_toplevel_handle_configure,
  	.close = xdg_toplevel_handle_close,
  };
  
  static void handle_global(void *data, struct wl_registry *registry,
  		uint32_t name, const char *interface, uint32_t version) {
  	if (strcmp(interface, "wl_compositor") == 0) {
  		compositor = wl_registry_bind(registry, name,
  			&wl_compositor_interface, 1);
  	} else if (strcmp(interface, xdg_wm_base_interface.name) == 0) {
  		wm_base = wl_registry_bind(registry, name, &xdg_wm_base_interface, 1);
  	} else if (strcmp(interface, zwp_idle_inhibit_manager_v1_interface.name) == 0) {
  		idle_inhibit_manager = wl_registry_bind(registry, name,
  			&zwp_idle_inhibit_manager_v1_interface, 1);
  	} else if (strcmp(interface, wl_seat_interface.name) == 0) {
  		seat = wl_registry_bind(registry, name, &wl_seat_interface, version);
  	}
  }
  
  static void handle_global_remove(void *data, struct wl_registry *registry,
  		uint32_t name) {
  	// who cares
  }
  
  static const struct wl_registry_listener registry_listener = {
  	.global = handle_global,
  	.global_remove = handle_global_remove,
  };
  
  int main(int argc, char **argv) {
  	struct wl_display *display = wl_display_connect(NULL);
  	if (display == NULL) {
  		fprintf(stderr, "Failed to create display\n");
  		return EXIT_FAILURE;
  	}
  
  	struct wl_registry *registry = wl_display_get_registry(display);
  	wl_registry_add_listener(registry, &registry_listener, NULL);
  	wl_display_dispatch(display);
  	wl_display_roundtrip(display);
  
  	if (compositor == NULL) {
  		fprintf(stderr, "wl-compositor not available\n");
  		return EXIT_FAILURE;
  	}
  	if (wm_base == NULL) {
  		fprintf(stderr, "xdg-shell not available\n");
  		return EXIT_FAILURE;
  	}
  	if (idle_inhibit_manager == NULL) {
  		fprintf(stderr, "idle-inhibit not available\n");
  		return EXIT_FAILURE;
  	}
  
  	wlr_egl_init(&egl, EGL_PLATFORM_WAYLAND_EXT, display, NULL,
  		WL_SHM_FORMAT_ARGB8888);
  
  	struct wl_surface *surface = wl_compositor_create_surface(compositor);
  	struct xdg_surface *xdg_surface =
  		xdg_wm_base_get_xdg_surface(wm_base, surface);
  	struct xdg_toplevel *xdg_toplevel = xdg_surface_get_toplevel(xdg_surface);
  
  	idle_inhibitor =
  		zwp_idle_inhibit_manager_v1_create_inhibitor(idle_inhibit_manager,
  		surface);
  
  	struct wl_pointer *pointer = wl_seat_get_pointer(seat);
  	wl_pointer_add_listener(pointer, &pointer_listener, surface);
  
  
  	xdg_surface_add_listener(xdg_surface, &xdg_surface_listener, NULL);
  	xdg_toplevel_add_listener(xdg_toplevel, &xdg_toplevel_listener, NULL);
  
  	wl_surface_commit(surface);
  
  	egl_window = wl_egl_window_create(surface, width, height);
  	egl_surface = wlr_egl_create_surface(&egl, egl_window);
  
  	wl_display_roundtrip(display);
  
  	draw();
  
  	while (wl_display_dispatch(display) != -1) {
  		// This space intentionally left blank
  	}
  
  	return EXIT_SUCCESS;
  }
  